Helianthus angustifolius swamp sunflower Asteraceae HEAN; R (DeCandido 2001);

 

Helianthus angustifolia.Thomas G. Barnes @ USDA-NRCS PLANTS Database.Barnes, T.G., and S.W. Francis. 2004. Wildflowers and ferns of Kentucky. University Press of Kentucky.IL

Helianthus angustifolia.Thomas G. Barnes @ USDA-NRCS PLANTS Database.Barnes, T.G., and S.W. Francis. 2004. Wildflowers and ferns of Kentucky. University Press of Kentucky. (Accessed 4/2014).

Perennial herb, 0.5-1.5 m tall (NYS S2, T), stems solitary, hairy. 

Leaves alternate except near base, 5-15 cm long, 0.2-1 cm wide, linear, stalkless, margin rolled under, dark green, rough above, pale, hairy below, basal leaves, when present, stalked and blade wider. 

Flowers yellow, rays 10-15, 1.5-3 cm long, disk red-purple 1.5-2 cm wide, basal bracts narrow, loose. 

Fruit dry, 1-seeded achene about 0.4 cm long, crowned by deciduous scales, surrounded by chaffy bracts of the floral base (receptacle). 

Wetland status: FACW. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: A pine barrens bog species, soil pH 4-7 (USDA, NRCS 2007).